Determine the purpose and triggering conditions for an Emergency Oxygen Supply Connection (EOSC)

Steps

1. Confirm the EOSC's purpose: to allow connection of a temporary auxiliary oxygen source during an emergency, maintenance shutdown, or primary source failure, without interrupting facility oxygen supply
2. Confirm EOSC is required (per NFPA 99) where the bulk cryogenic liquid central supply system is located outside of and remote from the building it serves, unless there is a connected in-building oxygen reserve sufficient for roughly a day's average supply
3. Confirm EOSC is also required where multiple freestanding buildings are served from a single bulk oxygen source such that damage to the interconnecting line could cut off supply to one or more buildings
4. Confirm that a more recent NFPA 99 edition (commonly cited starting with the 2021 edition) requires the EOSC to include a master alarm monitoring connection point — verify this against the edition actually adopted by the AHJ
5. Confirm EOSC siting coordinates with NFPA 55 bulk oxygen siting rules (e.g., not located over asphalt or similar paving) since the connection is part of the bulk supply system